Analysis and optimization of a dual-absorption power cycle utilizing low-temperature geothermal energy
The low and medium grade energy is abundant and difficult to use efficiently.This paper has proposed a dual-absorption power cycle,in which low-temperature geothermal energy can be efficiently recovered and power output can be increased as well.This cycle consists of an ammonia-water mixture Kalina cycle(KC)and an absorption heat transform(AHT),and it is modeled by considering mass,energy and species balances for every component and thermodynamic analyses are conducted.The results show that the proposed power cycle has good performance,with net power output increasing by 10%than that of KC,for a typical operating condition.Parametric analyses are performed for the proposed power cycle to evaluate the effects of key factors on the performance of the proposed cycle through simulation calculations.The effects of the condensation temperature,ammonia mass fraction and pressure on the cycle efficiency are studied.The new objective function is proposed to optimize the ammonia mass fraction and pressure.Results show that the power output of DA cycle could increase by about 10%compared to that of Kalina cycle system and the ammonia mass fraction of about 0.8 or so is suitable for the DA cycle.The annual earning of electricity of the DA cycle is €0.16x106 more than that of the Kalina cycle.
Ammonia-water mixture Kalina cycle system Absorption heat transform Geothermal power generation
Wencheng Fu Jialing Zhu Wei Zhang Chengke Niu
Tianjin Geothermal Research and Training Center,Tianjin University,No 92 Weijin Road,Tianjin 300072, Key Laboratory of Efficient Utilization of Low and Medium Grade Energy,MOE,Tianjin University,Tianji
国际会议
桂林
英文
1-14
2013-07-16（万方平台首次上网日期，不代表论文的发表时间）